MOUNTAIN VIEW, Calif. — When cute smiley faces started popping up in text messages in Japan during the 1990s, software engineers like Mark Davis didn’t know if the digital images called emojis were just a fad.

But by 2006, emojis were more popular and tech firms — including Google, the company Davis works for — wanted to operate with Japanese cellphone carriers.

“The problem was that there were three different carriers that all had different sets of emojis. They used the same code for different emojis,” said Davis, co-founder and president of the Unicode Consortium, “and different codes for the same emojis.”

Approving emojis sounded like a job for the Mountain View nonprofit, which has relationships with companies, governments and other organizations worldwide. The volunteer group creates and updates global standards for every character displayed online, such as letters and symbols. This helps make sure that when people receive messages via a computer or cellphone, they see what the sender intended.

Davis sat down with the San Jose Mercury News via Skype to talk about the rise of emojis and the work that the Unicode Consortium does:

Q: Symbols have different meanings in different cultures. How do you account for that when deciding which emojis to approve? When Apple introduced new racially diverse emojis, some praised the move while others raised concerns about racist comments.

A: We do have to consider issues like skin color when we make these decisions. We have a set of criteria to assess a proposal for new emojis. Suppose you wanted a mole emoji, for example. What you do is you fill out a form. We have a number of factors we ask you to supply information about, including evidence for why this would be a popular emoji. It doesn’t need to be an emoji that would be popular in America or Europe. It could be an emoji that would really be popular in China or India.

Q: Emojis have been called the fastest-growing language in the world. Is it a language and why do you think it’s become so popular?

A: The answer is no for me. You see that really quickly if you try to express anything very detailed in emojis like “let’s meet at 3 o’clock unless my dentist appointment goes long and then we should go to the coffeehouse around the corner.” Things that are tricky to express in English are very difficult to express in emojis. But emojis help to fill the gaps in short written communication. On video, you can see my expression, you can see my hand gesture, hear my tone. I can hear yours, and it’s a much richer communication than just text. I think that’s why it’s become so popular. It can add a lot of flavor and emotion, especially to text communication, which by its nature is very prosaic

Q: Hillary Clinton once asked people on Twitter to describe how student debt made them feel in three emojis or fewer. It got some backlash. When is it appropriate to use emojis to express your feelings and when is it not?

A: I think like all communication it depends on the circumstance. If you write in English, you’re going to write differently if it’s a formal setting, a workplace setting or when texting a friend. We have yet to see how it’s going to play out and in which circumstances people are going to use emojis. But I expect people will use them in many casual settings.

Q: Are there any dark sides to the use of emojis? Some people say it creates a digital mask.

A: One of the myths is that emojis are universal. But the way these symbols are interpreted really depends highly on your culture and language. There’s a certain amount of adapting to emojis as well. We look at these emojis and they bring something to mind. We start to send them to other people with that in mind and they gradually develop accepted meanings.

Q: Do you think there’s going to be a more expressive form of communication in the digital world beyond emojis?

A: That’s an interesting question. I’m not going to look into my crystal ball for you, which is an emoji by the way.